Behaviors of Zinc in Blast Furnace of Baotou Iron and Steel (Group) Co.

Based on the contents of zinc in the input and output except for the production data of No. 6 BF of Baotou Iron and Steel (Group) Co., the equilibrium distribution of zinc was calculated. Moreover, the particle sizes of gas ash of No.6 BF were measured by LS230 laser particle size analyzer; the micro-morphology of all input and output was investigated by means of scanning electron microscopy (SEM, Hitachi S-3000) coupled with an energy-dispersive X-ray analysis (EDX). The results show that the general burdens of zinc were 0.625kg/t, and some measures need to be taken to reduce the contents of zinc of sinter and pellet. The amount of zinc emitted from blast furnace with gas ash was 96.14% (in mass). Therefore BF gas ash isn′t appropriate to be recovered as the sintering materials. Furthermore, the zinc-adsorbate equally distributed in gas ash and the particles with different sizes had distinct ability to adsorb zinc. Zinc in gas ash presents as not only ZnO mainly, but also ferrite, silicate, aluminum or sulfide. Zinc in coagulation in tuyere existed in the state of metal Zn or lead-zinc alloy.